Ocean acoustic wave propagation and ray method correspondence: internal wave fine structure

Details Ocean acoustic wave propagation and ray method correspondence: internal wave fine structure Ocean acoustic wave propagation and ray method correspondence: internal wave fine structure

2003-12-30

arxiv.org/abs/physics/0312150v3

Physics

Atmospheric and Oceanic Physics

16 pages with 10 figures incorporated into the text. Manuscript accepted to the North Pacific Acoustic Laboratory (NPAL) Speci

Scientific paper

Acoustic wave fields propagating long ranges through the ocean are refracted by the inhomogeneities in the ocean's sound speed profile. Intuitively, for a given acoustic source frequency, the inhomogeneities become ineffective at refracting the field beyond a certain fine scale determined by the acoustic wavelength. On the other hand, ray methods are sensitive to infinitely fine features. Thus, it is possible to complicate arbitrarily the ray dynamics, and yet have the wave field propagate unchanged. This feature raises doubts about the ray/wave correspondence. Given the importance of various analyses relying on ray methods, a proper model should, at a minimum, exclude all of the fine structure that does not significantly alter the propagated wave field when the correspondence to the ray dynamics is integral. We develop a simple, efficient, smoothing technique to be applied to the inhomogeneities - a low pass filtering performed in the spatial domain - and give a characterization of its necessary extent as a function of acoustic source frequency. We indicate how the smoothing improves the ray/wave correspondence, and show that the so-called ``ray chaos'' problem remains above a very low frequency (about 15-25 Hz).

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